US3670383A - Method of manufacture of an oil seal ring having dual scraper elements for rotary piston mechanisms - Google Patents

Method of manufacture of an oil seal ring having dual scraper elements for rotary piston mechanisms Download PDF

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Publication number
US3670383A
US3670383A US137284A US3670383DA US3670383A US 3670383 A US3670383 A US 3670383A US 137284 A US137284 A US 137284A US 3670383D A US3670383D A US 3670383DA US 3670383 A US3670383 A US 3670383A
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US
United States
Prior art keywords
seal ring
oil seal
annular
blank
rotary piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US137284A
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English (en)
Inventor
Michael T Gavrun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
John Deere Technologies International Inc
Original Assignee
Curtiss Wright Corp
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Filing date
Publication date
Application filed by Curtiss Wright Corp filed Critical Curtiss Wright Corp
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Publication of US3670383A publication Critical patent/US3670383A/en
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Assigned to JOHN DEERE TECHNOLOGIES INTERNATIONAL, INC. reassignment JOHN DEERE TECHNOLOGIES INTERNATIONAL, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CURTISS-WRIGHT CORPORATION, A CORP. OF DE
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436—Pressing means
    • F16J15/344—Pressing means the pressing force being applied by means of an elastic ring supporting the slip-ring
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49274—Piston ring or piston packing making
    • Y10T29/49279—Piston ring or piston packing making including rolling or die forming, e.g., drawing, punching

Definitions

  • the invention relates to a method of fabricating oil seal rings for rotary piston mechanisms, and more specifically, a method of producing oil seal rings having dual, concentric scraper blades or edges.
  • oil seal ring assemblies are carried in the side faces of the rotor or piston, inwardly of the gas seal strips, to minimize the escape of lubricating oil from the region of the rotor shaft gearing. It was found, as shown in the aforesaid patents, desirable to provide an oil seal ring assembly having two concentrically spaced, annular scraper lips or edges which abut the adjacent housing end wall substantially along a circular line.
  • Such oil seal ring assemblies require a considerable number of relatively accurate machining and assembly steps to fabricate.
  • the insertion of the seal ring assemblies in the rotors in the course of assembly of the engines is difficult because of the multiplicity of components comprising the seal ring assemblies.
  • This seal ring configuration when in use, defines between the housing end wall and the seal ring an annular chamber of wedge shape, in cross section, which chamber functions to cause the oil to exert a hydrodynamic force on a portion of the seal ring and thereby cause that portion of the scraper edge to lift off the housing end wall and the oil in the chamber to flow inwardly past the outer scraper edge.
  • This invention thus contemplates a method of producing an oil seal ring, having two spaced, concentric, annular, scraper lips or edges, comprising the step of disposing a flan or blank of flat sheet material between the fixed die face and a complementary movable die face of a stamping and forming device, squeezing the flan or blank between the fixed and movable die faces to deform the flan to form two annular concentrically spaced raised portions and substantially simultaneously cutting or punching out two spaced concentric rings to form the inner and outer peripheral surfaces of the seal ring.
  • the method includes the step of forming the outer scraper edge inwardly of the outer peripheral surface of the seal ring by partial shearing deformation of the flan.
  • FIG. 1 is a schematic cross-sectional, fragmentary view of a stamping and forming device which may be employed to carry out the method according to this invention
  • FIG. 2 is a plan view of the oil seal ring produced by the method according to the present invention.
  • FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2 and on an enlarged scale;
  • FIG. 4 is a fragmentary view, in cross-section, showing the oil seal ring fabricated according to this invention assembled in a rotary piston mechanism.
  • FIG. 1, 10 generally designates a coining and punching device which may be employed to produce an oil seal ring 12 (see FIGS. 2 and 3) according to the method of the present invention.
  • a flan, planchet or blank 14 of sheet material and of substantially the thickness of the seal ring to be fabricated is positioned between and against the face 16 on a stationary die portion 18.
  • the stationary die portion 18 has an annular recess 20 in face 16, the bottom portion of which is shaped to provide two annular concentric apices 22 and 24 formed by annular, inclined surfaces 26 and 28 and respectively intersecting annular, vertical surfaces 30 and 32.
  • a movable die portion 34 including spaced, concentric cutters or blades 36 and 37, is disposed adjacent to and in axial alignment with die portion 18. Conventional means (not shown) is provided for reciprocatively actuating movable die portion 34 relative to stationary die face 16.
  • the movable die portion 34 has an annular die face 38 having a configuration substantially complementary to die face 16. More specifically, die face 38 has two spaced annular, inwardly tapering surfaces 40 and 42 which are complementary to inclined surfaces 26 and 28 of die face 16.
  • die portion 34 is next actuated to abut blank 14 and squeeze the blank within annular recess 20 and thereby cause the blank to deform and plasticly flow into the configuration established by the shape of the recess 20 and die face 38.
  • blades 36 and 37 are driven relative to die faces 16 and 38 into annular slots 44 and 45, respectively, in stationary die portion 18 to punch-out or cut the blank 14 to form the inner and outer peripheral surfaces 46 and 48 of the resultant oil seal ring 12 (shown in broken lines in FIG. 1 and in full lines in FIGS. 2, 3 and 4).
  • the recess 20 in die face 16 and die face 38 cooperate to form two annular concentrically spaced, annular, scraper edges or lips 50 and 52 on the oil seal ring 12.
  • the scraper edge 52 is created at the intersection of an annular inclined surface 53 and inner peripheral surface 46 while scraper edge 50 is formed by the intersection of an inclined, annular surface 54 and an annular, vertically extending wall 56.
  • scraper edge 50 of oil seal ring 12 if formed inwardly of the outer peripheral surface 48 by locating annular, vertical surfaces 30 in recess 20 and a complementary annular, vertical surface 60 on die face 38 inwardly of the outer peripheral surfaces of their respective die portions. These two vertical surfaces 30 and 60 coact with inclined surfaces 26 and 40 to cause scraper edge 50 to be formed along a shear line. It also serves, as best illustrated in FIG. 4, to provide oil seal ring 12 with annular inclined surface 54 which in use defines with a rotary piston housing side wall 64, an annular chamber 66.
  • the inclined surface 62 gives chamber 66 a wedgelike cross-sectional shape so that the oil imposes a hydrodynamic force on a portion of the seal ring to cause that portion of scraper edge 50 to lift off housing side wall 64 thereby permitting leakage oil in the chamber 66 to flow past scraper edge 50 and away from the gas seals (not shown).
  • the method provides a relatively quick, simple and inexpensive means of producing an oil seal ring having dual, concentrically spaced, scraper edges. It is also a method by which the outer scraper edge of the fabricated oil seal ring is defined by the intersection of a vertical wall spaced inwardly of the peripheral surface and an annular surface inclined in a direction away from the plane of the scraper edges.
  • one of the two annular edge portions is formed by deforming the inner annular area of the oil seal ring being fabricated to provide an annular inclined surface and punching out the inner portion of the blank to intersect the inclined surface and form the inner peripheral surface of the oil seal ring.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Sealing Devices (AREA)
US137284A 1971-04-26 1971-04-26 Method of manufacture of an oil seal ring having dual scraper elements for rotary piston mechanisms Expired - Lifetime US3670383A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13728471A 1971-04-26 1971-04-26

Publications (1)

Publication Number Publication Date
US3670383A true US3670383A (en) 1972-06-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
US137284A Expired - Lifetime US3670383A (en) 1971-04-26 1971-04-26 Method of manufacture of an oil seal ring having dual scraper elements for rotary piston mechanisms

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US (1) US3670383A (de)
DE (1) DE2218312A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4835856A (en) * 1986-07-05 1989-06-06 Sanden Corporation Piston ring manufacturing method
US5161402A (en) * 1990-08-06 1992-11-10 Akebono Brake Industry Co., Ltd. Chamfering pressing machine
US6601284B1 (en) * 1995-12-27 2003-08-05 Meritor Heavy Vehicle Technology, Llc Composite brake drum and method for producing same
US20040227301A1 (en) * 2003-05-15 2004-11-18 Wood Michael H. Combination oil scrapper ring/gas seal assembly
US20070113612A1 (en) * 2005-11-22 2007-05-24 Kato Seisakusyo Co., Ltd. Manufacturing method for a press work product
CN102729197A (zh) * 2012-06-14 2012-10-17 苏州速腾电子科技有限公司 一种油封压入式工装
US20140017443A1 (en) * 2012-07-12 2014-01-16 Honda Motor Co., Ltd. Piercing method, production method for structure having hole, and structure having hole
CN104759841A (zh) * 2012-11-08 2015-07-08 合肥通用机械研究院 断口式中分密封环的加工方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132197A (en) * 1934-08-31 1938-10-04 Jr Edmund R Week Method of making piston rings
US2305064A (en) * 1940-11-25 1942-12-15 Thompson Prod Inc Machine for making flexible valve seat inserts
US3400939A (en) * 1966-01-03 1968-09-10 Curtiss Wright Corp Oil seal construction for rotary engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132197A (en) * 1934-08-31 1938-10-04 Jr Edmund R Week Method of making piston rings
US2305064A (en) * 1940-11-25 1942-12-15 Thompson Prod Inc Machine for making flexible valve seat inserts
US3400939A (en) * 1966-01-03 1968-09-10 Curtiss Wright Corp Oil seal construction for rotary engines

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4835856A (en) * 1986-07-05 1989-06-06 Sanden Corporation Piston ring manufacturing method
AU595626B2 (en) * 1986-07-05 1990-04-05 Sanden Corporation Piston ring manufacturing method
US5161402A (en) * 1990-08-06 1992-11-10 Akebono Brake Industry Co., Ltd. Chamfering pressing machine
US6601284B1 (en) * 1995-12-27 2003-08-05 Meritor Heavy Vehicle Technology, Llc Composite brake drum and method for producing same
US20040227301A1 (en) * 2003-05-15 2004-11-18 Wood Michael H. Combination oil scrapper ring/gas seal assembly
US6959930B2 (en) 2003-05-15 2005-11-01 Delaware Capital Formation, Inc. Combination oil scrapper ring/gas seal assembly
US20070113612A1 (en) * 2005-11-22 2007-05-24 Kato Seisakusyo Co., Ltd. Manufacturing method for a press work product
CN102729197A (zh) * 2012-06-14 2012-10-17 苏州速腾电子科技有限公司 一种油封压入式工装
US20140017443A1 (en) * 2012-07-12 2014-01-16 Honda Motor Co., Ltd. Piercing method, production method for structure having hole, and structure having hole
CN104759841A (zh) * 2012-11-08 2015-07-08 合肥通用机械研究院 断口式中分密封环的加工方法

Also Published As

Publication number Publication date
DE2218312A1 (de) 1972-12-07

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Legal Events

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AS Assignment

Owner name: JOHN DEERE TECHNOLOGIES INTERNATIONAL, INC., JOHN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CURTISS-WRIGHT CORPORATION, A CORP. OF DE;REEL/FRAME:005646/0925

Effective date: 19840223